1. Without being seen
   "these organisms enter the body invisibly"

See also: invisible

Antonym: visibly

• barrel cactus
• barrel knot
• barrel maker
• barrel of laughs
• barrel organ
• barrel roll
• barrel vault
• barrel-shaped
• barreled
• barrelfish
• barrelful
• barrelhead
• barrelhouse
• barrelled
• barrels
• barren
• barren ground caribou
• barrenness
• barrenwort
• barrette
• barretter
• barricade
• barricaded
• barricado
• Barrie